Silicate melts containing H2O in the lowermost mantle are surprisingly dense and may stagnate there, trapping primordial volatiles and potentially causing some of the ultra-low velocity zones.
K2-18b is warm, has an atmosphere, and has water vapor. But it’s no Earth 2.0.
This discovery is the latest in a growing stack of evidence pointing to the presence of an ammonia-rich water ocean beneath Pluto’s icy crust.
Researchers find that past studies underestimate the friction meltwater channels exert on glaciers by orders of magnitude.
Samples returned from the surface of an asteroid show that these small bodies may have more water than previously thought and could have delivered that water to Earth.
Sediments from the Curiosity rover and experiments using tanks of gas and laser beams helped reveal how water continued to flow on Mars after the planet lost its atmospheric carbon dioxide.
Dried-up rivers on Mars suggest that the planet was wet in the not-too-distant past.
Deep water cycle studies have largely focused on subduction of lithosphere formed at fast spreading ridges. However, oceanic plates are more likely to become hydrated as spreading rate decreases.
Thermal modeling suggests that active magmatism in the past few hundred thousand years could account for the presence of a large lake previously hypothesized beneath the Red Planet’s southern ice cap.
Hydrated minerals on near-Earth asteroids offer both scientific revelations and economic incentives for companies looking to refuel satellites with material from nearby space.